<?xml version='1.0'?>
<xs:schema targetNamespace="http://www.w3.org/XML/1998/namespace" xmlns:xs="http://www.w3.org/2001/XMLSchema" xml:lang="en">

    <xs:annotation>
        <xs:documentation>
            See http://www.w3.org/XML/1998/namespace.html and
            http://www.w3.org/TR/REC-xml for information about this namespace.

            This schema document describes the XML namespace, in a form
            suitable for import by other schema documents.

            Note that local names in this namespace are intended to be defined
            only by the World Wide Web Consortium or its subgroups.  The
            following names are currently defined in this namespace and should
            not be used with conflicting semantics by any Working Group,
            specification, or document instance:

            base (as an attribute name): denotes an attribute whose value
            provides a URI to be used as the base for interpreting any
            relative URIs in the scope of the element on which it
            appears; its value is inherited.  This name is reserved
            by virtue of its definition in the XML Base specification.

            lang (as an attribute name): denotes an attribute whose value
            is a language code for the natural language of the content of
            any element; its value is inherited.  This name is reserved
            by virtue of its definition in the XML specification.

            space (as an attribute name): denotes an attribute whose
            value is a keyword indicating what whitespace processing
            discipline is intended for the content of the element; its
            value is inherited.  This name is reserved by virtue of its
            definition in the XML specification.

            Father (in any context at all): denotes Jon Bosak, the chair of
            the original XML Working Group.  This name is reserved by
            the following decision of the W3C XML Plenary and
            XML Coordination groups:

            In appreciation for his vision, leadership and dedication
            the W3C XML Plenary on this 10th day of February, 2000
            reserves for Jon Bosak in perpetuity the XML name
            xml:Father
        </xs:documentation>
    </xs:annotation>

    <xs:annotation>
        <xs:documentation>This schema defines attributes and an attribute group
            suitable for use by
            schemas wishing to allow xml:base, xml:lang or xml:space attributes
            on elements they define.

            To enable this, such a schema must import this schema
            for the XML namespace, e.g. as follows:
            &lt;schema . . .>
            . . .
            &lt;import namespace="http://www.w3.org/XML/1998/namespace"
            schemaLocation="http://www.w3.org/2001/03/xml.xsd"/>

            Subsequently, qualified reference to any of the attributes
            or the group defined below will have the desired effect, e.g.

            &lt;type . . .>
            . . .
            &lt;attributeGroup ref="xml:specialAttrs"/>

            will define a type which will schema-validate an instance
            element with any of those attributes</xs:documentation>
    </xs:annotation>

    <xs:annotation>
        <xs:documentation>In keeping with the XML Schema WG's standard versioning
            policy, this schema document will persist at
            http://www.w3.org/2001/03/xml.xsd.
            At the date of issue it can also be found at
            http://www.w3.org/2001/xml.xsd.
            The schema document at that URI may however change in the future,
            in order to remain compatible with the latest version of XML Schema
            itself.  In other words, if the XML Schema namespace changes, the version
            of this document at
            http://www.w3.org/2001/xml.xsd will change
            accordingly; the version at
            http://www.w3.org/2001/03/xml.xsd will not change.
        </xs:documentation>
    </xs:annotation>

    <xs:attribute name="lang" type="xs:language">
        <xs:annotation>
            <xs:documentation>In due course, we should install the relevant ISO 2- and 3-letter
                codes as the enumerated possible values . . .</xs:documentation>
        </xs:annotation>
    </xs:attribute>

    <xs:attribute name="space" default="preserve">
        <xs:simpleType>
            <xs:restriction base="xs:NCName">
                <xs:enumeration value="default"/>
                <xs:enumeration value="preserve"/>
            </xs:restriction>
        </xs:simpleType>
    </xs:attribute>

    <xs:attribute name="base" type="xs:anyURI">
        <xs:annotation>
            <xs:documentation>See http://www.w3.org/TR/xmlbase/ for
                information about this attribute.</xs:documentation>
        </xs:annotation>
    </xs:attribute>

    <xs:attributeGroup name="specialAttrs">
        <xs:attribute ref="xml:base"/>
        <xs:attribute ref="xml:lang"/>
        <xs:attribute ref="xml:space"/>
    </xs:attributeGroup>

</xs:schema>